[GRASS-user] Re: link to datasets from other locations?

[Micha Silver]

Nikos Alexandris wrote:

> Hamish:
> ...
>
>   
>> *every* single GIS I have seen which does on-the-fly reprojection has
>> had major problems which can present itself in a way which is not
>> obvious to the user (typically due to mixed datums).
>>     
>
>   
>> Then the user happily goes along doing their work, publishing their
>> reports, only sometimes realizing that something has misaligned
>> internally.
>>     
>
>   
>> Or ugly non-solutions like rubber sheet dragging to visually correct
>> the misalignment without considering the real cause become taught as
>> the de facto method in the workflow. (easier than teaching about
>> ellipsoids and datum math)
>>     
>
>
> Added in GRASS-wiki [1]:
>
>   
And in addition I entered a paragraph in the "Tips for Arc Users" page
http://grass.osgeo.org/grass-wiki/Tips_for_Arc_users
since the original question reflected a misunderstanding that some of us 
Arc converts have to deal with.
-- 
Micha

> "GRASS' logical database structure (one projection definition per
> LOCATION) is designed to avoid problems such as the ones introduced with
> the "on-the-fly" reprojection ability (typically problems caused by
> mixed datums) which is present in most GISes."
>
> Nikos
> ---
>
> [1] http://grass.osgeo.org/wiki/Location_and_Mapsets
>
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